Rapid Assessment of Vegetation Condition after Wildfire (RAVG) Composite Burn Index (Map Service)

The USDA Forest Service Rapid Assessment of Vegetation Condition after Wildfire (RAVG) program produces geospatial data and maps of post-fire vegetation condition using standardized change detection methods based on Landsat or similar multispectral satellite imagery. RAVG data products characterize vegetation condition within a fire perimeter, and include estimates of percent change in basal area (BA), percent change in canopy cover (CC), and a standardized composite burn index (CBI). Standard thematic products include 7-class percent change in basal area (BA-7), 5-class percent change in canopy cover (CC-5), and 4-class CBI (CBI-4). Contingent upon the availability of suitable imagery, RAVG products are prepared for all wildland fires reported within the conterminous United States (CONUS) that include at least 1000 acres of forested National Forest System (NFS) land (500 acres for Regions 8 and 9 as of 2016). Data for individual fires are typically made available within 45 days after fire containment ("initial assessments"). Late-season fires, however, may be deferred until the following spring or summer ("extended assessments"). National mosaics of each thematic product are prepared annually. Mosaics of extended assessments, if any, are provided separately from initial assessment mosaics. This map service includes annual raster mosaics of published CBI-4 datasets for fires that burned during calendar years 2012 through 2023, excluding 2020 extended assessments. The associated burned area perimeters are available via the Enterprise Data Warehouse (EDW, see https://data.fs.usda.gov/geodata/edw/datasets.php).This record was taken from the USDA Enterprise Data Inventory that feeds into the https://data.gov catalog. Data for this record includes the following resources: ISO-19139 metadata ArcGIS Hub Dataset ArcGIS GeoService For complete information, please visit https://data.gov.

美国农业部森林服务局快速评估森林火灾后植被状况（RAVG）项目，通过基于Landsat或类似多光谱卫星图像的标准化变化检测方法，生成森林火灾后植被状况的地理空间数据和地图。RAVG数据产品对火灾范围内的植被状况进行描述，包括基础面积（BA）百分比变化、冠层覆盖率（CC）百分比变化以及标准化综合燃烧指数（CBI）的估算。标准主题产品包括基础面积（BA-7）7类百分比变化、冠层覆盖率（CC-5）5类百分比变化和CBI-4 4类。根据适宜影像的可用性，RAVG产品针对美国大陆（CONUS）内报告的所有至少包含1000英亩国有森林系统（NFS）林地（自2016年起，第八区和第九区为500英亩）的森林火灾进行制作。通常在火灾被控制后45天内发布单个火灾的数据（“初步评估”）。然而，季节性火灾可能会推迟到下一个春季或夏季（“扩展评估”）。每年还会准备每个主题产品的国家拼图。如果有的话，扩展评估拼图将单独提供，与初步评估拼图分开。此地图服务包括2012年至2023年日历年度内燃烧的火灾发布的CBI-4数据集的年度栅格拼图，不包括2020年的扩展评估。相关的燃烧面积边界可通过企业数据仓库（EDW，见https://data.fs.usda.gov/geodata/edw/datasets.php）获取。本记录摘自提供数据.gov目录的USDA企业数据清单。本记录的数据包括以下资源：ISO-19139元数据、ArcGIS Hub数据集、ArcGIS地理服务。欲获取完整信息，请访问https://data.gov。